Specifications

12 Volt electrical specifications:
The following describes the low voltage electrical system on the apparatus including all panels, electrical
components, switches and relays, wiring harnesses and other electrical components. The apparatus
manufacturer shall conform to the latest Federal DOT standards and the applicable requirements of the NFPA
#1901
• Wiring shall be stranded copper or copper alloy conductors of a gauge rated to carry 125% of the
maximum current for which the circuit is protected
• Voltage drops shall not exceed 10% in all wiring from the power source to the using device
• Wiring and wiring harness and insulation shall be in conformance with applicable SAE and NFPA
standards. The wiring harness shall conform to SAE J-1128 and with GXL temperature properties
• Exposed wiring shall be run in a loom with a minimum 289° Fahrenheit rating
• Wiring looms shall be properly supported and attached to body members
• Electrical conductors shall be constructed in accordance with applicable SAE standards
• All wiring connections and terminations shall provide positive mechanical and electrical connections
and shall be installed in accordance with the device manufacturer’s instructions. When wiring passes
through metal panels electrical connections shall be with mechanical type fasteners and rubber
grommets.
• Wiring between cab and body shall be split using Deutsche type connectors or enclosed in a terminal
junction
• Connections shall be crimp-type with heat shrink tubing with insulated shanks. Weather resistant
connectors shall be provided throughout the system
• Electrical junction or terminal boxes shall be weather resistant and located away from water spray
conditions
• Automatic reset breakers and relays shall be housed in the main body junction panel
• There shall be no exposed electrical cabling, harnesses or terminal connections located in
compartments unless enclosed in an electrical junction box or covered with a removable electrical
panel. Wiring shall be secured in place and protected against heat, liquid contaminants and damage
and shall be uniquely identified at least every two (2) feet by color coding or permanent marking with a
circuit function code and identified on a reference chart or electrical wiring schematic per requirements
of applicable NFPA #1901 standards
• Low voltage over current protective devices shall be provided for the electrical circuits. Devices shall be
located in required terminal connection locations or weather resistant enclosures. Over current
protection devices shall be automatic reset type suitable for electrical equipment and meet SAE
standards
• All electrical equipment, switches, relays, terminals and connectors shall have a direct current rating of
125% of maximum current for which the circuit is protected. Electro-magnetic interference
suppression shall be provided in the system as required in applicable SAE standards
Electrical system requirements:
The electrical system shall include the following:
• Electrical terminals in weather exposed areas shall have an non-conductive grease or spray applied. All
terminal plugs located outside of the cab or body shall be treated with a corrosion preventative
compound